config

Documentation

Overview

Package config loads Prism configuration from prism.yaml and environment.

Index

• func ModelContextWindow(model string) int
• type Config
  • func Default() *Config
  • func LoadFromDir(dir string) (*Config, error)
  • func (c *Config) ContextWindow() int
  • func (c *Config) WithModel(model string) *Config

Functions

func ModelContextWindow

func ModelContextWindow(model string) int

ModelContextWindow maps known model name substrings to their context window. Matching is case-insensitive prefix/substring to handle versioned IDs like "claude-sonnet-4-6" or "gpt-4o-2024-11-20" without exhaustive enumeration.

Types

type Config

type Config struct {
	GroveURL    string
	GroveBinary string
	// Model is the active AI model identifier. There is NO auto-detection —
	// the MCP initialize handshake does not carry the model — so it is set
	// only via prism.yaml, PRISM_MODEL, or a per-call model= argument. When
	// empty, ContextWindow() returns a safe 200k default that covers all
	// current production models.
	Model         string
	Profile       string
	MaxCacheFiles int
	Port          int
	// ArchDeny holds declared architecture rules, one per `arch_deny:` line
	// in prism.yaml: "<from> -> <to>" where each side is a component name
	// (directory), a prefix (covers subdirectories), a glob, or "*".
	// Validated by prism arch / prism_arch_check against the induced
	// component view; every violation cites concrete file:line sites.
	ArchDeny []string
}

Config holds the resolved Prism configuration.

func Default

func Default() *Config

Default returns config values with environment overrides applied. Model intentionally defaults to "" (unset — 200k-window default applies).

func LoadFromDir

func LoadFromDir(dir string) (*Config, error)

LoadFromDir looks for prism.yaml in dir and merges over Default(). Parser is intentionally minimal: KEY: VALUE per line, comments with '#'. This keeps Prism single-binary with no YAML dep.

func (*Config) ContextWindow

func (c *Config) ContextWindow() int

ContextWindow returns the total context window in tokens for the model. When Model is empty or unrecognised, returns a safe 200k default that is correct for all current Claude models and generous for others.

func (*Config) WithModel

func (c *Config) WithModel(model string) *Config

WithModel returns a shallow copy of the config with Model overridden. Use this for per-call effective context windows without mutating state.